Hull for ships.



um-843,016. PATENTED FEB. 5, 1907.

o. HOLBY.

-HUL L FOR SHIPS. V

APPLICATION FILED SEPT. 2.7. 1906.

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THE NORRIS PETERS p0, wnmucmu, n. c

No. 843,016. PATENTED FEB. 5, 1907. o.- HOLBY.

HULL FOR SHIPS. APPLICATION nun 8321.21, 1905.

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OLAF I-IOLBY, OF CHRISTIANIA, NORWAY.

HULL FOR SHIPS.

Specification of Letters Patent.

Patented. Feb. 5, 1907.

Application filediSeptem'ber 27,1905- Serial No. 280,308.

To all whom it may concern.-

Be it known that I, OLAF HOLBY, a subject of the King of Norway, residing at Christiania, Norway, have invented certain new and useful Improvements in Hulls for Ships; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to hulls for ships; and the object of the present improvements is to give the hull such form which. will in heavy.

sea lessen the rolling and pitching of the vessel and also decrease the loss of speeri which is caused by the pitching. These ends are attained by way of sloping surfaces provided for at such parts of the hull which are most exposed to the pitchings, said surfaces being of such form that at the movements of the ship in heavy sea they will press on the water in a rearward direction.

In the drawings, which show one form of carrying out my invention, Figures 1 and 2.

are side view and plan view of the improved hull. Figs. 3 and 4 are rear and front end views of one side of the hull at a larger scale, showing the shape of the frames or ribs of the vessel at different planes.

The hull proper is near the rear end provi-ded with a projecting wing of the shape of a keel or stem, the axial plane of which has an inclination relatively to the vertical plane. At the back this wing is preferably of a somewhat sharp or pointed form, whereas in front it is broader and. successively approaches the shape of the hull at its bottom and its sides. The said projection in this manner will form a kind of bilge or rolling keel, although its function is somewhat different, as the downward face of the projection forms a slope the pitch of which is so placed that when the ship is pressing its rear part down in the water the projection will force the water in a rearward direction, it being, so to say, caught between the wing and the hull proper.

As the top side of the projecting wing also has a pitch of a backward direction, both the downgoing and the upgoing movement of hull will cause a pushing action to take place by the water pressing on the wing. As compared with a usual rolling keel, the present invention has the advantage that quite broad reaction-surfaces may be obtained without coming outside of the profile of the hull, as will be clearly seen in Fig. 3. Moreover, the additional space obtained may be utilized as ballasttank, whereby useful space for loading purpose may be saved.

The wing A is placed below the waterline; but I may provide similar projections above the water-line. Such projection is preferably placed at the stem of the ship, as at B. In this case only the lower side of the projection acts as a reaction-surface. When the ship sets its stem down in the sea, the lower side of the projection B will render resistance against the water and prevent the stem from coming too far into the water. At the same time it will cause a forward pressure on the ship on account of its sloping form. It is not necessary, of course, that the projection B shall be in all its extent above the water-line. It may partly dip into the water. It may also be given a greater length, so that it extends over quite a long distance of the side of the hull.

I preferably provide the hulls with the described projections as well in the front as in th e the rear of the ship; but I may in certain cases prefer to make use only of the front or the rear projections.

I claim 1. A ships hull havinga bilge projection at its forward end whose under surface slopes upward and rearward and is normally wholly above the water-line and inactive in calm weather, said under surface serving to propel the ship forward during pitching in heavy seas.

'2. A ships hull having a forward bilge projection at its forward end whose under surface slopes upward and rearward and is normally above the water-line and a bilge projection at each side of the keel at the stern projecting downwardly and outwardly and inclined upwardly toward the rear and concave surfaces connecting the bilge projections with the keel and extending upwardly to ward the rear whereby the pitching of the vessel will propel it forward.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

OLAF I-IOLBY.

Witnesses:

O. MI'JLLER, JON VAALER. 

